JPH09200984A - Rotor with magnet for rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an air gap so as to prevent breakage due to centrifugal force at a high rotating speed of a magnet by making the binder thinner. SOLUTION: A cylindrical magnet 3 is arranged on the outer periphery of a rotor center 2. A disk portion 4a of a side plate 4 having a U-shaped cross section and a hole in a central portion is fixed to the rotor center 2 with screws 4s through cushion 7. Outside diameter of the cylindrical portion 4b of the side plate 4 is made almost the same as the outside diameter of a magnet 3, and slits 5 are provided in the cylindrical portion 4b. A starting end 6s of a tape 6 made of glass fiber constituting a binding 6 wound around the outer periphery of the magnet 3 is alternately passed through a plurality of slits 5 and then fixed. A knot of the starting end 6s may be hooked to one of slits 5. The end 6e may be alternately passed through the slits 5; or plastic deformation may be made around the slits 5 and the tape may be firmly caught and fixed by the slits. The tape 6a can be firmly wound by a machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor with a magnet for a rotary electric machine such as a servomotor.

[0002]

2. Description of the Related Art Conventionally, a magnet arranged in a cylindrical shape on the outer circumference of a rotor center may be divided into a circumferential direction or a cylindrical shape. In order to prevent the magnets divided in the circumferential direction as well as the cylindrical magnets from being damaged by the centrifugal force of high-speed rotation, a tape made of glass fiber or the like is wound to form a binding. Secure the beginning of the tape extra, press it with your hand and press it with the first roll of the tape to prevent it from loosening due to frictional resistance, then release your hand and wind it in order. At that time, the extra start end may be cut off, or it may be pressed after the second roll. This is the manual work at the beginning of the tape. At the end of the tape, hold the tape before the first roll by hand to make the end dive, pull the end and press with the tape before the first roll to prevent it from loosening due to frictional resistance, and then separate the end. Manual end of tape. The winding itself can be done by machine.
The tape may be triple wound over the length of the magnet.
After winding the tape, varnish it and machine the outer periphery of the binding if necessary so that it does not come into contact with the stator.

[0003]

In the above-mentioned conventional example, a skill is required for the manual work of the leading end and the trailing end of the tape. Since the friction resistance is used at the beginning and the end, the tension of winding the tape is not large. Therefore, in order to prevent damage due to the centrifugal force of the high-speed rotation of the magnet, it is necessary to make multiple windings, the binding becomes thicker, and the gap with the stator increases,
The magnetic resistance increases. Even if the binding does not break, the binding is likely to loosen with the lapse of time, the tightening force of the magnet on the rotor center decreases, and the magnet may remain idle with respect to the rotor center.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor with a magnet for a rotary electric machine, which can prevent the magnet from being damaged by centrifugal force of high-speed rotation even if the binding is made thin and can reduce the air gap.

[0005]

A rotor with a magnet for a rotating electric machine according to the first aspect of the present invention is a disk portion of a side plate having a U-shaped cross section having a cylindrical magnet arranged on the outer periphery of a rotor center and having a hole in the center. Is fixed to the rotor center, the outer diameter of the cylindrical portion of the side plate is made substantially the same as the outer diameter of the magnet, and at least one cut is provided in the cylindrical portion, and the binding wire or the starting end of the tape wound around the outer circumference of the magnet. Alternatively, the terminal end is inserted and fixed to the inner peripheral side of the cut.

According to the first aspect of the invention, since the binding line or the starting end or the terminating end of the tape is inserted and fixed to the inner peripheral side of the slit of the cylindrical portion of the side plate, the starting end or the terminating end of the tape requires skill. However, it is possible to increase the winding tension of the tape. For this reason, even if the binding is made thin, it is possible to prevent the magnet from being damaged by the centrifugal force of high-speed rotation and to reduce the gap.

A second aspect of the present invention is the same as the first aspect, in which the cut is bent toward the inner peripheral side to form the blade. According to the invention 2, a cooling action can be added. A third aspect of the present invention is the same as the first or second aspect, wherein a soft cushion is interposed between the side plate and the magnet. According to the invention 3, the brittle magnet can be prevented from being damaged due to the sticking of the side plate.

In the rotor with magnet of the rotating electric machine of the invention 4, the magnet is arranged in a cylindrical shape on the outer circumference of the rotor center, and the binding wound around the outer circumference of the magnet is made of metal for insulation treatment. According to the invention 4, the binding is made of metal and has higher mechanical fatigue fracture strength and greater elongation than glass fiber or the like, and the tension of winding the binding can be further increased. Therefore, even if the binding is made thin, it is possible to prevent the magnet from being damaged by the centrifugal force of high-speed rotation, and further to reduce the gap. Also, the binding is insulated to prevent the generation of eddy currents.

In addition, in invention 4, invention 1, 2 or 3
You may add the structure of. A fifth aspect of the present invention is the same as the fourth aspect, wherein the metal binding is a tape-shaped braid. According to the fifth aspect of the invention, even if the strands constituting the braid are broken, the braid itself is not broken and the binding purpose is maintained. Invention 6 is the same as Invention 4 or 5, wherein the metal binding is made of a material having a small thermal expansion coefficient.
According to the invention 6, even if the temperature of the rotor rises, the thermal expansion of the binding is small and the purpose of the binding is maintained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view including a perspective view of an essential part of the first embodiment, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of an essential part of the second embodiment, and FIG. FIG. 5 is a front view of the main part of the embodiment 4.
6 is a sectional view of the fifth embodiment, FIG. 7 is a front view of FIG. 6, FIG. 8 is a sectional view of the sixth embodiment, and FIG. 9 is a front view of FIG. In the drawings, the parts denoted by the same reference numerals have substantially the same functions, and description thereof may be omitted.

In FIGS. 1 and 2, a magnet 3 having a cylindrical shape, which is divided in the circumferential direction, is arranged on the outer circumference of a rotor center 2 fitted to a shaft 1. The disk portion 4a of the side plate 4 having a hole in the center and having a U-shaped cross section is fixed to the rotor center 2 with screws 4s or rivets, and the outer diameter of the cylindrical portion 4b of the side plate 4 is substantially the same as the outer diameter of the magnet 3. To At least one cut 5 is provided in the cylindrical portion 4b. The starting end 6s of the tape 6a such as glass fiber wound around the outer periphery of the magnet 3 to form the binding 6 is inserted and fixed to the inner peripheral side of the cut 5. A cushion 7 made of soft rubber or aluminum may be interposed between the side plate 4 and the magnet 3. Starting end 6 of tape 6a
In order to fix s to the cut 5, a plurality of cuts 5 may be alternately passed, a knot at the starting end 6s may be hooked on one cut 5, or a knot at the starting end 6s may be set at 1
After being inserted in the cut 5, the tape 6a is strongly sandwiched by plastically deforming around the cut 5. The winding itself of the tape 6a is mechanically performed as in the conventional case. Tape 6a
In order to fix the end 6e of the end to the cut 5, similar to the start 6s, the end 6e is alternately passed through the cut 5, or the cut 5 is cut.
It will be plastically deformed and pinched strongly.

According to the first embodiment, the beginning 6s or the end 6e of the tape 6a of the binding 6 is the cylindrical portion 4 of the side plate 4.
Since it is inserted and fixed to the inner peripheral side of the cut 5 of b,
No skill is required for the starting or terminating manual work of the tape 6a, and the winding tension of the tape 6a can be increased. Therefore, even if the binding 6 is thin, the magnet 3
The damage due to the centrifugal force of the high speed rotation can be prevented, and the gap can be reduced. If the cushion 7 is interposed, the brittle magnet 3 can be prevented from being damaged by the sticking of the side plate 4, and the thin tape 6a can be prevented from being caught in the R portion 4r when the side plate 4 is pressed. When the tape 6a is wound an even number of times over the entire length of the magnet 3, the side plate 4 is sufficient on one side. At the odd number of times, the structure shown in the figure may be adopted for either the start end or the end manual work.
Adopting s contributes to increase the winding tension of the tape 6a. Because of the cut 5, the start or end hand work can be easily entrusted to mechanical work such as an electric hand. After winding the tape 6a, a varnish treatment is carried out if necessary, and the outer periphery of the binding 6 is machined if necessary so as not to come into contact with the stator. The tape 6a may be a film instead of a fiber.

In the second embodiment shown in FIG. 3, the cut 21 of the first embodiment is bent toward the inner peripheral side to form the blade 21. Example 2
According to the above, the cooling effect can be added by the blades 21. FIG.
3 is a modification of the cut line 5 of the first embodiment, and the cut line 35 is a hole. Example 4 shown in FIG. 5 is a modification of the cut line 5 of Example 1, and the cut line 45 is formed by bending a U-shaped slit 45a toward the inner peripheral side. The bent portion can be used as a blade to add a cooling action as in the second embodiment.

In the fifth embodiment shown in FIGS. 6 and 7, the magnet 3 is arranged in a cylindrical shape on the outer periphery of the rotor center 2, and the magnet 3
The binding 56 wound around the outer circumference is an insulated wire (magnet wire or the like) 56a made of metal such as copper. The non-insulated wire may be insulated after winding. Although the start and end of the wire 56a may be manually performed as in the conventional example, the side plate 4 and the cut 5 may be provided to fix the start and end as in the first embodiment. Although not shown, the cushion 7 may be interposed. As in the second embodiment, a blade may be provided at the cut 5 to add a cooling effect. Wire 56a may be stainless steel.

According to the fifth embodiment, the wire 56a of the binding 56 is made of metal, has a higher mechanical fatigue fracture strength and a larger elongation than glass fiber, and the elastic limit of elongation can be accurately and clearly predicted. In the mechanical work of winding the wire 56a, it is possible to set the winding tension to be larger. Therefore, even if the binding 56 is made thin, it is possible to prevent the magnet 3 from being damaged by the centrifugal force of the high-speed rotation,
Further, the void can be made smaller. Since the binding 56 is stretched and wound within the elastic limit, the fixation of the magnet 3 to the rotor center 2 is prevented from loosening due to thermal expansion and idling. Also, the binding 56 is insulated to prevent the generation of eddy currents.

In the sixth embodiment shown in FIGS. 8 and 9, the metal binding 66 is insulated as a tape-shaped braid 66a. According to the sixth embodiment, the purpose of the binding 66 is maintained without breaking the braid 66a itself even if the strands of wire constituting the braid 66a are broken. In the fifth or sixth embodiment, the metal binding 56 or 66 is used.
Is a material having a small coefficient of thermal expansion such as amber, even if the temperature of the rotor rises, the binding 56 or 66
Has a low thermal expansion and maintains the purpose of binding.

[0017]

According to the rotor with magnet of the rotating electric machine of the invention 1, since the starting end or the terminating end of the binding is fixed by the cut of the side plate, the starting end or the terminating end of the tape does not require any skill. The winding tension of the tape can be increased, and even if the binding is thinned, the magnet can be prevented from being damaged by the centrifugal force of high-speed rotation, and the gap can be reduced.

According to the second aspect of the invention, there is an effect that a cooling action can be added by the blade. According to the third aspect of the invention, there is an effect that the brittle magnet can be prevented from being damaged due to the side plate being fixed by the cushion. According to the rotor with magnet of the rotating electric machine of the invention 4,
Since the binding is made of metal, the winding tension can be further increased, so even if the binding is made thinner, it is possible to prevent damage due to the centrifugal force of the high-speed rotation of the magnet, and to further reduce the air gap. There is.

According to the invention 5, there is an effect that the purpose of binding is maintained without breaking the braid itself even if the strands constituting the braid are broken. According to the invention 6, even if the temperature of the rotor rises, the thermal expansion of the binding is small and the purpose of the binding is maintained.

[Brief description of drawings]

FIG. 1 is a sectional view including a perspective view of a main part of the first embodiment.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a perspective view of a main part of the second embodiment.

FIG. 4 is a front view of a main part of the third embodiment.

FIG. 5 is a front view of a main part of the fourth embodiment.

FIG. 6 is a sectional view of the fifth embodiment.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a sectional view of Example 6.

FIG. 9 is a front view of FIG. 8;

[Explanation of symbols]

1 axis 2 rotor center 3 magnet 4 side plate 4a disk part 4b cylindrical part 4s screw 5 break 6 binding 6a tape 6e end 6s start end 7 cushion 21 blade 35 break 45 break 45a slit 56 binding 56a line 66 binding 66 binding

Claims (6)

[Claims] 1. A magnet is arranged in a cylindrical shape on the outer periphery of a rotor center, a disk portion of a side plate having a U-shaped cross section is fixed to the rotor center, and the outer diameter of the cylindrical portion of the side plate is a magnet. The diameter of the binding is approximately the same as the outer diameter of the magnet, and at least one cut is provided in the cylindrical portion, and the beginning or end of the binding wire or tape wound around the outer circumference of the magnet is inserted and fixed to the inner circumference of the cut. A rotor with a magnet for a rotating electric machine characterized by. 2. A rotor with a magnet for a rotary electric machine according to claim 1, wherein the blade is formed by bending a cut toward the inner peripheral side. 3. The rotor with magnet of the rotating electric machine according to claim 1, wherein a soft cushion is interposed between the side plate and the magnet. 4. A rotor with a magnet for a rotary electric machine, wherein a magnet is arranged in a cylindrical shape on the outer circumference of a rotor center, and a binding wound around the outer circumference of the magnet is made of metal for insulation treatment. 5. The rotor with magnet of the rotating electric machine according to claim 4, wherein the metal binding is a tape-shaped braid. 6. The rotor with magnet of the rotating electric machine according to claim 4 or 5, wherein the metallic binding is made of a material having a small thermal expansion coefficient.